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data offset (DAO)

The Data Offset field (DAO) in the TCP header indicates how many 32-bit words are in the TCP header. Since the options are variable in length, this field is needed to describe the beginning of the user data in the corresponding segment.

Data offset field in the TCP

Data offset field in the TCP

header The TCP header with its options always has a multiple of 32. If no options are present, the value of the offset corresponds to 5.

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Englisch: data offset - DAO
Updated at: 11.03.2008
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